The mobilities of Cs+ ions in Ar, Kr, and Xe gases at 300 °K have been measured in a drift tube mass spectrometer for a wide range of values of the energy parameter E/N (the ratio of the electric field strength to the gas number density). Ion neutral interaction potentials have also been derived for each case (Cs+–Ar, Cs+–Kr, and Cs+–Xe). A kinetic theory appropriate to the nonthermalized ion motion is used to derive the mobilities from the potentials, and an iterative technique is used to modify the potentials to fit the experimental data. Various tests of the accuracy and uniqueness of the method indicate that this determination of the potentials gives errors in the potential parameters, e.g., well depth, well position, etc., which are less than about 10%.
Total scattering cross-section measurements for 'He+ 'He and 'He+ 'He are presented for velocities between 60 and 900 m/sec and 105 to 1000 m/sec, respectively. For 'He+ He, a Ramsauer-Townsend effect is resolved and s and d phase shifts are obtained. The behavior of the s phase shift suggests that this system is not bound. For 'He+ 'He a virtual state at 135 m/sec is resolved and some p phase shifts are obtained. A fit to the data for both pairs indicates that mass-polarization effects are negligible.
Recently much attention has been paid to the behavior of excess electrons in dense polyatomic gases. I -4 This has been probed by electron mobility and quasifree electron energy measurements. It was observed that the electron mobility decreased in a certain density region somewhat more than does the inverse density dependence of electron mobility in low density gases predict. 4
The mobilities of Rb+ ions in Kr and Xe gases have been measured at 300'K in a drift tube mass spectrometer over a wide range of the ionic energy parameter E / N (the ratio of the electric field intensity to the neutral gas number density). The Viehland-Mason kinetic theory of ionic mobility (valid for arbitrary E / N) is used to derive theoretical mobilities from the electron gas-Drude model potentials of Gordon and Waldman for Rb+ -Ar (mobilities measured previously), Rb+ -Kr, and Rb+ -Xe. The results are compared with the experimental data. Further, by using an iterative technique, new potentials are developed which are determined directly by the experimental data, and these "experimental" potentials are tabulated and compared with the Gordon-Waldman potentials. mobilities in cm 2 /V sec).
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